Minehillite Mineral Data

Minehillite Mineral Data +

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General Minehillite Information

Chemical Formula:

(K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16

Composition:

Molecular Weight = 4,786.44 gm

Potassium 1.55 % K 1.87 % K₂O

Sodium 0.14 % Na 0.19 % Na₂O

Calcium 23.03 % Ca 32.22 % CaO

Magnesium 0.05 % Mg 0.08 % MgO

Manganese 0.11 % Mn 0.15 % MnO

Aluminum 2.48 % Al 4.69 % Al₂O₃

Zinc 6.56 % Zn 8.16 % ZnO

Iron 0.12 % Fe 0.15 % FeO

Silicon 23.12 % Si 49.46 % SiO₂

Hydrogen 0.32 % H 2.86 % H₂O

Oxygen 42.52 % O

______ ______

100.00 % 99.83 % = TOTAL OXIDE

Empirical Formula:

K_1.9Na_0.3Fe²⁺_0.1Mg_0.1Mn²⁺_0.1Ca_27.5Zn_4.8Al_4.4Si_39.4O₁₁₂(OH)_15.2

Environment:

Secondary low-temperature mineral found in a metamorphosed stratiform zinc deposit.

IMA Status:

Approved IMA 1984

Locality:

Mine Hill at Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 79739

PDF 38-371

Minehillite Image

Images:

Minehillite Margarosanite Wollastonite-1A

Comments: White pearly crystalline minehillite with white margarosanite and dark gray lead, in pale pink opaque wollastonite (distinguished by blue-white fluorescence).
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Minehillite Crystallography

Axial Ratios:

a:c = 1:3.40523

Cell Dimensions:

a = 9.777, c = 33.293, Z = 1; V = 2,756.10 Den(Calc)= 2.88

Crystal System:

HexagonalSpace Group: P 6₃/mmm, P 62c, or P 6₃mc

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.764(1), 1.847(0.9), 16.1(0.7),

Crystal Structure:

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Dai Y S , Post J E , Appleman D E , American Mineralogist , 80 (1995) p.173-178, Crystal structure of minehillite: Twinning and structural relationships to, reyerite

Physical Properties of Minehillite

Cleavage:

[0001] Perfect

Color:

Colorless, Gray white, Grayish black, White.

Density:

2.93

Diaphaniety:

Transparent

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

4 - Fluorite

Luminescence:

Fluorescent, Short UV=dull violet, Long UV=dull violet.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Minehillite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2102,KPDmeas= 0.2067,KC= 0.2076

Optical Data:

Uniaxial (-), e=1.604, w=1.607, bire=0.0030.

Calculated Properties of Minehillite

Electron Density:

r_electron=2.92 gm/cc
note: r_Minehillite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.01407
Boson Index = 0.98593

Photoelectric:

PE_Minehillite= 7.17 barns/electron
U=PE_Minehillite x r_electron= 20.91 barns/cc.

Radioactivity:

GRapi = 22.27 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Minehillite - barely detectable

Minehillite Classification

Dana Class:

73.2.2b.1 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.2)with double and single layers

(73.2.2b)Reyerite group (Minehillite Subgroup)

73.2.2b.1 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

73.2.2b.2 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

Strunz Class:

VIII/H.34-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with other simple layers, [Si6O15]6- and others

VIII/H.34 - Gyrolite series

VIII/H.34-10 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

VIII/H.34-20 Truscottite (Ca,Mn)14Si24O58(OH)8·2(H2O) p3 or p3 Trig

VIII/H.34-25 Orlymanite Ca4Mn3Si8O20(OH)6·2(H2O) P 3-,P 3 Trig

VIII/H.34-28 Fedorite KNa4Ca4(Al,Si)16O36(OH,F)4·6(H2O) C1 1

VIII/H.34-30 Reyerite (Na,K)4Ca14Si22Al2O58(OH)8·6(H2O) P 3 3

VIII/H.34-40 Gyrolite NaCa16Si23AlO60(OH)8·64(H2O) P 6₁ 6

VIII/H.34-45 Tungusite Ca14(OH)8(Si8O20)3Fe9(OH)14 P1 1

VIII/H.34-50 Zeophyllite Ca4Si3O8(OH,F)4·2(H2O) R 3 3

VIII/H.34-70 Armstrongite CaZrSi6O15·3(H2O) C 2 2

Other Minehillite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Minehillite

(K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16
Dana No: 73.2.2b.1 Strunz No: VIII/H.34-10
Locality:

Notes: